The International Association of Plumbing and Mechanical Officials (IAPMO) recently published the monograph of proposed changes to the WE-Stand, which is short for Water Efficiency and Sanitation Standard. The document was previously identified as the Green Supplement.
In many ways, WE-Stand competes with the International Green Construction Code, which is promulgated by ASHRAE, International Code Council (ICC) and U.S. Green Building Council (USGBC). If you compare the two documents relating to green plumbing, you will find the WE-Stand to be much more detailed and much more complete. ASHRAE, ICC and USGBC need to catch up to the level of the IAPMO standard.